MJPEG acceleration for video capture using VAAPI

content/common/gpu/client/gpu_channel_host.cc

Index: content/common/gpu/client/gpu_channel_host.cc
diff --git a/content/common/gpu/client/gpu_channel_host.cc b/content/common/gpu/client/gpu_channel_host.cc
index aa47e2fd677bad9d115abb27209433292689fe57..c6f1ea66f9c760c34a331b8d2768456a09640be2 100644
--- a/content/common/gpu/client/gpu_channel_host.cc
+++ b/content/common/gpu/client/gpu_channel_host.cc
@@ -13,6 +13,7 @@
 #include "base/threading/thread_restrictions.h"
 #include "base/trace_event/trace_event.h"
 #include "content/common/gpu/client/command_buffer_proxy_impl.h"
+#include "content/common/gpu/client/gpu_jpeg_decode_accelerator_host.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "ipc/ipc_sync_message_filter.h"
 #include "url/gurl.h"
@@ -256,6 +257,27 @@ scoped_ptr<media::VideoEncodeAccelerator> GpuChannelHost::CreateVideoEncoder(
   return it->second->CreateVideoEncoder();
 }
 
+scoped_ptr<media::JpegDecodeAccelerator> GpuChannelHost::CreateJpegDecoder(
+    scoped_refptr<base::MessageLoopProxy> reply_loop) {
+  TRACE_EVENT0("gpu", "GpuChannelHost::CreateJpegDecoder");
+  // This function is called from GpuJpegDecoder's capture task thread, which is

[wuchengli, 2015/05/06 07:59:18]

s/which is//

[kcwu, 2015/05/08 14:42:42]

Acknowledged.
Revised to use jpeg thread.

+  // not main thread.
+
+  int32 route_id = GenerateRouteID();
+  GpuJpegDecodeAcceleratorHost* decoder(new GpuJpegDecodeAcceleratorHost(
+      this, route_id, factory_->GetIOLoopProxy()));
+
+  // GpuJpegDecoder's capture task thread (i.e., device thread on Linux) is
+  // usually waiting for next frame, so decoder responses are sent to
+  // |reply_loop| directly.
+  scoped_refptr<base::MessageLoopProxy> io_loop = factory_->GetIOLoopProxy();
+  io_loop->PostTask(FROM_HERE,
+                    base::Bind(&GpuChannelHost::MessageFilter::AddRoute,
+                               channel_filter_.get(), route_id,
+                               decoder->AsWeakPtr(), reply_loop));
+  return scoped_ptr<media::JpegDecodeAccelerator>(decoder);
+}
+
 void GpuChannelHost::DestroyCommandBuffer(
     CommandBufferProxyImpl* command_buffer) {
   TRACE_EVENT0("gpu", "GpuChannelHost::DestroyCommandBuffer");